ESP8266

Why ESP8266?

• Many varieties
• Many possibilities
• Price and programmability: very affordable and easy to connect with other sensors

What is the connection to coffee?

• A few share even the same name (Espresso Light)
• Both are affordable, enjoyable and powerful

Working with ESP8266

Install Arduino

• Go into preferences and add the URL for ESP8266
• Go to Tools > Board Manager and type in ESP8266 and install it
• In Tools: make sure ESP8266 is really selected
• Choose LOLIN(WEMOS) D1 R2 & mini

ESP8266 Micro Sensor

• Find the right sensor and a USB-cable
• Put everything together and plug it into the PC

First Exercise: Blink

• In Arduino, go to File > Example > Basics > Blink
• Verify it, choose port and click on the arrow to upload.
• Let it blink.
• You can change the delay and creater longer breaks

Note from Ulrich:

• ESP8266 always works with 3V. Everything higher will destroy the sensor. However, the hardware has a regulator to make a connection with USB-port possible (USB has 5V).
• On the sensors are many letters: D(GPIO = General Port Input Output), AO(Analog) & G(Ground)

HelloServer-Exercise

• File > Examples > ESP8266WebServer > HelloServer
• Analyze Code
• Add a SSID and its password
• Go to Tool > Serial Monitor and set baud to 115200 (or the serial that is specified in the code)
• Use the ESP8266 reset-button and achieve an ip address
• Put the ip address in the browser and get the message
• Add lines from the blinking code and restart code
• Add /on or /off to the URL in the browser and you should be able to turn off or on the light on the sensor

Note: The command is inverted. /on turns off the LED and /off turns on the LED, because in the hardware 0 and 1 are switched.